My roll marked 457 has a KMF prefix and appears to have been a December 1998 gun (Spec Ord 8307). My Laser etched 457 has a TDP prefix and appears to be a late 1999 gun (Spec Ord 9136).

My railed 3913TSW is Laser etched and has a VJH prefix. I called CS and they said October 2002. That matches the info in the SCSW 4th edition. I have a box for a 3913TSW (not matching the gun), and that looks to be a mid 2001 gun.

My pre rail 3913TSW and 3953TSW are both Laser etched and have MSE pre fixes. No box for the 3913 and the label on the 3953 is damaged where the Spec Ord number is, but that appears to be a mid 1997 production.

I think all TSW guns have Laser etched slides, but the serial number ranges might help.

Speaking of Laser etching, there is a shop near me that just announced that they now can do Laser etching. I don't know if they can replicate the S&W etching, but it might be something people in eastern MA would be interested in exploring.

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Can open, worms everywhere.